Revise SystemInfo (#2047)

* Revise SystemInfo

Cleans up and adds a bit more info (logical core count and available mem at launch) to logs.

- Extract CPU name from CPUID when supported.
- Linux: Robust parsing of procfs files
- Windows: Prefer native calls to WMI
- Remove unnecessary virtual specifiers

* Address gdkchan's comments

* Address AcK's comments

* Address formatting nits

5 files changed, 213 insertions, 77 deletions

diff --git a/Ryujinx.Common/SystemInfo/LinuxSystemInfo.cs b/Ryujinx.Common/SystemInfo/LinuxSystemInfo.cs
index f067083e..069cd5aa 100644
--- a/Ryujinx.Common/SystemInfo/LinuxSystemInfo.cs
+++ b/Ryujinx.Common/SystemInfo/LinuxSystemInfo.cs
@@ -1,19 +1,80 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
 using System.IO;
-using System.Linq;
 using System.Runtime.Versioning;
+using Ryujinx.Common.Logging;
 
 namespace Ryujinx.Common.SystemInfo
 {
     [SupportedOSPlatform("linux")]
-    internal class LinuxSystemInfo : SystemInfo
+    class LinuxSystemInfo : SystemInfo
     {
-        public override string CpuName { get; }
-        public override ulong RamSize { get; }
+        internal LinuxSystemInfo()
+        {
+            string cpuName = GetCpuidCpuName();
+
+            if (cpuName == null)
+            {
+                var cpuDict = new Dictionary<string, string>(StringComparer.Ordinal)
+                {
+                    ["model name"] = null,
+                    ["Processor"] = null,
+                    ["Hardware"] = null
+                };
+
+                ParseKeyValues("/proc/cpuinfo", cpuDict);
+
+                cpuName = cpuDict["model name"] ?? cpuDict["Processor"] ?? cpuDict["Hardware"] ?? "Unknown";
+            }
+
+            var memDict = new Dictionary<string, string>(StringComparer.Ordinal)
+            {
+                ["MemTotal"] = null,
+                ["MemAvailable"] = null
+            };
+
+            ParseKeyValues("/proc/meminfo", memDict);
+
+            // Entries are in KB
+            ulong.TryParse(memDict["MemTotal"]?.Split(' ')[0], NumberStyles.Integer, CultureInfo.InvariantCulture, out ulong totalKB);
+            ulong.TryParse(memDict["MemAvailable"]?.Split(' ')[0], NumberStyles.Integer, CultureInfo.InvariantCulture, out ulong availableKB);
+
+            CpuName = $"{cpuName} ; {LogicalCoreCount} logical";
+            RamTotal = totalKB * 1024;
+            RamAvailable = availableKB * 1024;
+        }
 
-        public LinuxSystemInfo()
+        private static void ParseKeyValues(string filePath, Dictionary<string, string> itemDict)
         {
-            CpuName = File.ReadAllLines("/proc/cpuinfo").Where(line => line.StartsWith("model name")).ToList()[0].Split(":")[1].Trim();
-            RamSize = ulong.Parse(File.ReadAllLines("/proc/meminfo")[0].Split(":")[1].Trim().Split(" ")[0]) * 1024;
+            if (!File.Exists(filePath))
+            {
+                Logger.Error?.Print(LogClass.Application, $"File \"{filePath}\" not found");
+
+                return;
+            }
+
+            int count = itemDict.Count;
+
+            using (StreamReader file = new StreamReader(filePath))
+            {
+                string line;
+                while ((line = file.ReadLine()) != null)
+                {
+                    string[] kvPair = line.Split(':', 2, StringSplitOptions.TrimEntries);
+
+                    if (kvPair.Length < 2) continue;
+
+                    string key = kvPair[0];
+
+                    if (itemDict.TryGetValue(key, out string value) && value == null)
+                    {
+                        itemDict[key] = kvPair[1];
+
+                        if (--count <= 0) break;
+                    }
+                }
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs b/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs
index ec069ca4..92b54902 100644
--- a/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs
+++ b/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs
@@ -8,10 +8,27 @@ using Ryujinx.Common.Logging;
 namespace Ryujinx.Common.SystemInfo
 {
     [SupportedOSPlatform("macos")]
-    internal class MacOSSystemInfo : SystemInfo
+    class MacOSSystemInfo : SystemInfo
     {
-        public override string CpuName { get; }
-        public override ulong RamSize { get; }
+        internal MacOSSystemInfo()
+        {
+            string cpuName = GetCpuidCpuName();
+
+            if (cpuName == null && sysctlbyname("machdep.cpu.brand_string", out cpuName) != 0)
+            {
+                cpuName = "Unknown";
+            }
+
+            ulong totalRAM = 0;
+
+            if (sysctlbyname("hw.memsize", ref totalRAM) != 0)  // Bytes
+            {
+                totalRAM = 0;
+            };
+
+            CpuName = $"{cpuName} ; {LogicalCoreCount} logical";
+            RamTotal = totalRAM;
+        }
 
         [DllImport("libSystem.dylib", CharSet = CharSet.Ansi, SetLastError = true)]
         private static extern int sysctlbyname(string name, IntPtr oldValue, ref ulong oldSize, IntPtr newValue, ulong newValueSize);
@@ -20,7 +37,11 @@ namespace Ryujinx.Common.SystemInfo
         {
             if (sysctlbyname(name, oldValue, ref oldSize, IntPtr.Zero, 0) == -1)
             {
-                return Marshal.GetLastWin32Error();
+                int err = Marshal.GetLastWin32Error();
+
+                Logger.Error?.Print(LogClass.Application, $"Cannot retrieve '{name}'. Error Code {err}");
+
+                return err;
             }
 
             return 0;
@@ -64,36 +85,5 @@ namespace Ryujinx.Common.SystemInfo
 
             return res;
         }
-
-        public MacOSSystemInfo()
-        {
-            ulong ramSize = 0;
-
-            int res = sysctlbyname("hw.memsize", ref ramSize);
-
-            if (res == 0)
-            {
-                RamSize = ramSize;
-            }
-            else
-            {
-                Logger.Error?.Print(LogClass.Application, $"Cannot get memory size, sysctlbyname error: {res}");
-
-                RamSize = 0;
-            }
-
-            res = sysctlbyname("machdep.cpu.brand_string", out string cpuName);
-
-            if (res == 0)
-            {
-                CpuName = cpuName;
-            }
-            else
-            {
-                Logger.Error?.Print(LogClass.Application, $"Cannot get CPU name, sysctlbyname error: {res}");
-
-                CpuName = "Unknown";
-            }
-        }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.Common/SystemInfo/SystemInfo.cs b/Ryujinx.Common/SystemInfo/SystemInfo.cs
index feb6b8f8..98f520bc 100644
--- a/Ryujinx.Common/SystemInfo/SystemInfo.cs
+++ b/Ryujinx.Common/SystemInfo/SystemInfo.cs
@@ -1,35 +1,80 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics.X86;
+using System.Text;
+using Ryujinx.Common.Logging;
 
 namespace Ryujinx.Common.SystemInfo
 {
     public class SystemInfo
     {
-        public virtual string OsDescription => $"{RuntimeInformation.OSDescription} ({RuntimeInformation.OSArchitecture})";
-        public virtual string CpuName => "Unknown";
-        public virtual ulong RamSize => 0;
-        public string RamSizeInMB => (RamSize == 0) ? "Unknown" : $"{RamSize / 1024 / 1024} MB";
+        public string OsDescription { get; protected set; }
+        public string CpuName { get; protected set; }
+        public ulong RamTotal { get; protected set; }
+        public ulong RamAvailable { get; protected set; }
+        protected static int LogicalCoreCount => Environment.ProcessorCount;
 
-        public static SystemInfo Instance { get; }
+        protected SystemInfo()
+        {
+            OsDescription = $"{RuntimeInformation.OSDescription} ({RuntimeInformation.OSArchitecture})";
+            CpuName = "Unknown";
+        }
+
+        private static string ToMBString(ulong bytesValue) => (bytesValue == 0) ? "Unknown" : $"{bytesValue / 1024 / 1024} MB";
+
+        public void Print()
+        {
+            Logger.Notice.Print(LogClass.Application, $"Operating System: {OsDescription}");
+            Logger.Notice.Print(LogClass.Application, $"CPU: {CpuName}");
+            Logger.Notice.Print(LogClass.Application, $"RAM: Total {ToMBString(RamTotal)} ; Available {ToMBString(RamAvailable)}");
+        }
 
-        static SystemInfo()
+        public static SystemInfo Gather()
         {
             if (OperatingSystem.IsWindows())
             {
-                Instance = new WindowsSystemInfo();
+                return new WindowsSystemInfo();
             }
             else if (OperatingSystem.IsLinux())
             {
-                Instance = new LinuxSystemInfo();
+                return new LinuxSystemInfo();
             }
             else if (OperatingSystem.IsMacOS())
             {
-                Instance = new MacOSSystemInfo();
+                return new MacOSSystemInfo();
             }
             else
             {
-                Instance = new SystemInfo();
+                Logger.Error?.Print(LogClass.Application, "SystemInfo unsupported on this platform");
+
+                return new SystemInfo();
             }
         }
+
+        // x86 exposes a 48 byte ASCII "CPU brand" string via CPUID leaves 0x80000002-0x80000004.
+        internal static string GetCpuidCpuName()
+        {
+            if (!X86Base.IsSupported)
+            {
+                return null;
+            }
+
+            // Check if CPU supports the query
+            if ((uint)X86Base.CpuId(unchecked((int)0x80000000), 0).Eax < 0x80000004)
+            {
+                return null;
+            }
+
+            int[] regs = new int[12];
+
+            for (uint i = 0; i < 3; ++i)
+            {
+                (regs[4 * i], regs[4 * i + 1], regs[4 * i + 2], regs[4 * i + 3]) = X86Base.CpuId((int)(0x80000002 + i), 0);
+            }
+
+            string name = Encoding.ASCII.GetString(MemoryMarshal.Cast<int, byte>(regs)).Replace('\0', ' ').Trim();
+
+            return string.IsNullOrEmpty(name) ? null : name;
+        }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.Common/SystemInfo/WindowsSystemInfo.cs b/Ryujinx.Common/SystemInfo/WindowsSystemInfo.cs
index 479dd25f..fdc8fb6a 100644
--- a/Ryujinx.Common/SystemInfo/WindowsSystemInfo.cs
+++ b/Ryujinx.Common/SystemInfo/WindowsSystemInfo.cs
@@ -1,48 +1,90 @@
-using Ryujinx.Common.Logging;
 using System;
+using System.Globalization;
 using System.Management;
 using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
+using Ryujinx.Common.Logging;
 
 namespace Ryujinx.Common.SystemInfo
 {
     [SupportedOSPlatform("windows")]
-    internal class WindowsSystemInfo : SystemInfo
+    class WindowsSystemInfo : SystemInfo
     {
-        public override string CpuName { get; }
-        public override ulong RamSize { get; }
+        internal WindowsSystemInfo()
+        {
+            CpuName = $"{GetCpuidCpuName() ?? GetCpuNameWMI()} ; {LogicalCoreCount} logical"; // WMI is very slow
+            (RamTotal, RamAvailable) = GetMemoryStats();
+        }
 
-        public WindowsSystemInfo()
+        private static (ulong Total, ulong Available) GetMemoryStats()
         {
-            bool wmiNotAvailable = false;
+            MemoryStatusEx memStatus = new MemoryStatusEx();
+            if (GlobalMemoryStatusEx(memStatus))
+            {
+                return (memStatus.TotalPhys, memStatus.AvailPhys); // Bytes
+            }
+            else
+            {
+                Logger.Error?.Print(LogClass.Application, $"GlobalMemoryStatusEx failed. Error {Marshal.GetLastWin32Error():X}");
+            }
 
-            try
+            return (0, 0);
+        }
+
+        private static string GetCpuNameWMI()
+        {
+            ManagementObjectCollection cpuObjs = GetWMIObjects("root\\CIMV2", "SELECT * FROM Win32_Processor");
+
+            if (cpuObjs != null)
             {
-                foreach (ManagementBaseObject mObject in new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_Processor").Get())
+                foreach (var cpuObj in cpuObjs)
                 {
-                    CpuName = mObject["Name"].ToString();
+                    return cpuObj["Name"].ToString().Trim();
                 }
+            }
 
-                foreach (ManagementBaseObject mObject in new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_OperatingSystem").Get())
-                {
-                    RamSize = ulong.Parse(mObject["TotalVisibleMemorySize"].ToString()) * 1024;
-                }
+            return Environment.GetEnvironmentVariable("PROCESSOR_IDENTIFIER").Trim();
+        }
+
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+        private class MemoryStatusEx
+        {
+            public uint Length;
+            public uint MemoryLoad;
+            public ulong TotalPhys;
+            public ulong AvailPhys;
+            public ulong TotalPageFile;
+            public ulong AvailPageFile;
+            public ulong TotalVirtual;
+            public ulong AvailVirtual;
+            public ulong AvailExtendedVirtual;
+
+            public MemoryStatusEx()
+            {
+                Length = (uint)Marshal.SizeOf(typeof(MemoryStatusEx));
             }
-            catch (PlatformNotSupportedException)
+        }
+
+        [return: MarshalAs(UnmanagedType.Bool)]
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+        private static extern bool GlobalMemoryStatusEx([In, Out] MemoryStatusEx lpBuffer);
+
+        private static ManagementObjectCollection GetWMIObjects(string scope, string query)
+        {
+            try
             {
-                wmiNotAvailable = true;
+                return new ManagementObjectSearcher(scope, query).Get();
             }
-            catch (COMException)
+            catch (PlatformNotSupportedException ex)
             {
-                wmiNotAvailable = true;
+                Logger.Error?.Print(LogClass.Application, $"WMI isn't available : {ex.Message}");
             }
-
-            if (wmiNotAvailable)
+            catch (COMException ex)
             {
-                Logger.Error?.Print(LogClass.Application, "WMI isn't available, system informations will use default values.");
-
-                CpuName = "Unknown";
+                Logger.Error?.Print(LogClass.Application, $"WMI isn't available : {ex.Message}");
             }
+
+            return null;
         }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx/Program.cs b/Ryujinx/Program.cs
index 24642b61..a3137cc1 100644
--- a/Ryujinx/Program.cs
+++ b/Ryujinx/Program.cs
@@ -168,9 +168,7 @@ namespace Ryujinx
         private static void PrintSystemInfo()
         {
             Logger.Notice.Print(LogClass.Application, $"Ryujinx Version: {Version}");
-            Logger.Notice.Print(LogClass.Application, $"Operating System: {SystemInfo.Instance.OsDescription}");
-            Logger.Notice.Print(LogClass.Application, $"CPU: {SystemInfo.Instance.CpuName}");
-            Logger.Notice.Print(LogClass.Application, $"Total RAM: {SystemInfo.Instance.RamSizeInMB}");
+            SystemInfo.Gather().Print();
 
             var enabledLogs = Logger.GetEnabledLevels();
             Logger.Notice.Print(LogClass.Application, $"Logs Enabled: {(enabledLogs.Count == 0 ? "<None>" : string.Join(", ", enabledLogs))}");